Alpha carrying device for subaqueous sound apparatus



Oct. 11, 1932. w. RUDOLPH 1,831,972

CARRYING mavm: FOR SUBAQUEOUS souNn APPARATUS Filed June 13, 1931 l 5 fl I; ll] 4 4 is l "m 14 i If 15 ,1 I6

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Patented Oct. 11, 1932 UNITE STATES PATENT OFFICE WILHELM RUDOLPH, OF KIEL, GERMANY, ASSIGNOR TO ELECTROACUSTIC GESELL- SCI-IAFT 1VIIT BESCHRANKTER HAFTUNG, OF KIEL, GERMANY, A FIRM A CARRYING DEVICE FOR SUBAQUEOUS SOUND APPARATUS Application filed June 13, 1931, Serial No. 544,268, and in Germany June 23, 1930.

It is well known to arrange subaqueous sound apparatus outside a ship in an. oblong carrier which has a cross-section of streamline form in the direction of travel of the ship. In this case, comparatively narrow limits are stipulated for the dimensions of such a carrier in consideration of its weight and its space requirement. On the other hand, the stresses of this carrier when the speed of the ship is high and, in particular, the transverse stresses at sharp turns and a high speed of the vessel at the same time, are extraordinarily high. According to the Joessel formula, which is commonly used at the present day, they already amount to many thousands of kilograms at the comparatively small angular positions of the carrier having dimensions customary at the present day.

Until now, owing to the extremely complicated form of such devices, they have been made of cast metal alloys, the moulds being made in such a manner that the recesses for the sound apparatus, their supply leads and the like, were formed in the casting and if they required any subsequent treatment at all, it was only slight. Since the number of materials which can be employed here is relatively small owing to the high degree of resistance to corrosion required, the stresses arising at high speeds of the ship and sharp turning circles, in conjunction with the demand for resistance to corrosion, lead to the discovery that merely cast pieces are unsuitable. The invention therefore consists in producing carriers, which are to be arranged outside the ship, from forged alloys which are unaflected by seawater. The forging is preferably effected in a special swage which has approximately the shape of the complete device to be produced, and a solid forging is obtained, whilst the recesses for the sound apparatus themselves and the passages for the supply leads are worked out of the solid forging by turning, milling and boring. Malleable coppernickel bronzes having a nickel content of more than 3% have proved to be particularly suitable for the purpose mentioned.

The invention is illustrated in the Figures 1 to 3 in which Fig. 1 shows the pressed piece for the carrying device in semi-finished condition,

Fig. 2 the pressed piece in finished condition, and

Fig. 3 the finished piece in combination with the carrying member and its attachment to the ship.

The pressed piece in Fig. 1 consists of a lower sword-shaped part 1 and an upper butt-end or piston part 2. The cross-section of the sword-shaped part is shown in broken lines at 3; the cross-section of the piston is circular.

In Fig. 2 the piston part is turned to form a flange 4 and a stud 5, which is later inserted in the piston head. For this purpose the stud is preferably cone-shaped as shown in doth ted lines in Fig. 3, so that the sword becomes firmly seated in the piston. The recesses for the subaqueous sound apparatus are illustrated at 6, 7, 8 and 9. In the case of circular apparatus these recesses are bored out. At 10 and 11 the bores for conducting the supply cables are indicated by broken lines.

In Fig. 3 the carrying device is joined to the conical piston head 12 by means of the flange 4. This head, in the protruded position, bears upon a base piece 13 provided with a stufling box 14. The base piece is fixed at 15 to the bottom of the ship 16. In the upper part of the figure at 17 can be seen a part of the casing or cylinder which accom modates the carrying device with the sound apparatus in the retracted position.

I claim In a submarine sound signalling device for vessels, a sound device carrier protrudable through the vessels hull and consisting of a socket supported in the vessel and a protrudable carrier element composed of an integral forging of non-corrosive material, having recesses for receiving the sound devices and having a cone-shaped stud at its upper end firmly seated in said socket.

In testimony whereof I affix my signature.

WILHELM RUDOLPH.

CERTIFICATE OF CORRECTION.

Patent No. 1,881,972. October 11 1932.

WILHELM RUDOLPH.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page I, in the heading to the printed specification, date of filing application in Germany, for "June 23, 1930" read "April 4, 1930"; and that the said Letters Patent should be read with this correction therein that the same may conform to the record oi the case in the Patent Office.

Signed and sealed this 6th day of December, A. D. 1932.

M. J. Moore, (Seal) Acting Commissioner of Patents. 

